Final answer:
The expected effects of cardiac glycosides include decreased heart rate, increased force of contraction, and modulation of neurohormonal systems.
Step-by-step explanation:
Cardiac glycosides have several expected effects on the cardiovascular system. The primary effects include decreased heart rate and increased force of contraction (positive inotropic effects), leading to an increased cardiac output. These drugs modulate neurohormonal systems, such as blocking the sequestering of calcium ions into the sarcoplasmic reticulum, resulting in higher intracellular calcium levels and greater strength of contraction. However, they do not cause decreased cardiac output or decreased force of contraction. Additionally, these drugs do not directly affect respiratory rate, intestinal peristalsis, or aldosterone secretion. They also do not increase blood volume.